version = the version of the API associated with the URL. See API Versions for the version number.

all = returns both service and product reviews.

merchant_identifier = the merchant's unique Feefo identifier, which in this example is example-retail-merchant.

unanswered_feedback = determines if reviews without merchant replies are included. In this example, the entire feedback will be suppressed if there are no merchant replies against the service element or any of the product elements.